High-Frequency Permeability of Ferromagnetic Materials

Abstract

In view of the possibility of obtaining fuller information about the domain structure of ferromagnetics, by measurements of permeability at high frequencies, a method has been developed of measuring the effective reversible permeability of ferromagnetic materials in wire form over a fairly wide range of frequencies. A comprehensive review of earlier work has been given by Allanson¹, and apart from the early work of Arkadiew², who used a spark-gap source, no measurements of permeability have been recorded at frequencies higher than about 2,000 Mc./s.